Input: rotary_encoder - use guard notation when acquiring mutex

Using guard notation makes the code more compact and error handling
more robust by ensuring that mutexes are released in all code paths
when control leaves critical section.

Reviewed-by: Javier Carrasco <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/misc/rotary_encoder.c

···
 	struct rotary_encoder *encoder = dev_id;
 	unsigned int state;
 
-	mutex_lock(&encoder->access_mutex);
+	guard(mutex)(&encoder->access_mutex);
 
 	state = rotary_encoder_get_state(encoder);
 
···
 		break;
 	}
 
-	mutex_unlock(&encoder->access_mutex);
-
 	return IRQ_HANDLED;
 }
 
···
 	struct rotary_encoder *encoder = dev_id;
 	unsigned int state;
 
-	mutex_lock(&encoder->access_mutex);
+	guard(mutex)(&encoder->access_mutex);
 
 	state = rotary_encoder_get_state(encoder);
 
···
 		}
 	}
 
-	mutex_unlock(&encoder->access_mutex);
-
 	return IRQ_HANDLED;
 }
 
···
 	struct rotary_encoder *encoder = dev_id;
 	unsigned int state;
 
-	mutex_lock(&encoder->access_mutex);
+	guard(mutex)(&encoder->access_mutex);
 
 	state = rotary_encoder_get_state(encoder);
 
-	if ((encoder->last_stable + 1) % 4 == state)
+	if ((encoder->last_stable + 1) % 4 == state) {
 		encoder->dir = 1;
-	else if (encoder->last_stable == (state + 1) % 4)
+		rotary_encoder_report_event(encoder);
+	} else if (encoder->last_stable == (state + 1) % 4) {
 		encoder->dir = -1;
-	else
-		goto out;
+		rotary_encoder_report_event(encoder);
+	}
 
-	rotary_encoder_report_event(encoder);
-
-out:
 	encoder->last_stable = state;
-	mutex_unlock(&encoder->access_mutex);
 
 	return IRQ_HANDLED;
 }